[ Vocabulary ]
A group in a scientific experiment that serves as a reference for comparison to the experimental group; a group that is untreated by the factor being tested.
A. variable
B. trials
C. control group
D. field study

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Grammar: Adjectives & PrepositionsThere is, There are, Some, AnyModals for DeductionPassive Voice - Present TensesSimple Past Tense and Past Perfect TenseConditional Sentences and Verb FormModals for Advice, Obligation/Prohibition, Necessity and Lack of NecessityPassive VoicesPresent SimpleVerb PhraseOther quiz:
Future Tenses › ViewDo you think _______________ ?
A. you are you going to retire before you’re sixty?
B. you will retire before you’re sixty ?
C. you are retiring before you’re sixty ?
Grammar › View
The are _____ boys running in the playground.
A. a
B. an
C. some
Verbal Phrases › ViewWhat is the appositive phrase in this sentence?
Chemistry, Sue’s favorite subject, is easy for her.
A. Chemistry
B. is easy
C. for her
D. Sue’s favorite subject
Modals of Obligation › View
– I failed the last exam.
– You ………..
A. must feel devastated
B. must to feel devastated
C. can´t be devastated
D. can´t to be devastated
